memo = {0: 0, 2: 3}
def solution(n):
    if n in memo:
        return memo[n]
    if n % 2 == 1:
        return 0
    
    answer = sum([solution(i*2) * 2 for i in range((n-2)//2)] + [solution(n-2) * 3] + [2])
    memo[n] = answer
    return answer % 1000000007